By default, when the Jet Reports Scheduler creates tasks in the Windows Task Scheduler, the task is created for autopilot.exe using C:\Program Files\JetReports [or C:\Program Files (x86) \JetReports on 64-bit systems]. If Jet is not installed on the C drive, this will cause issues with your scheduled reports. To resolve your issue, you will need to redirect the scheduled task to the appropriate drive.
To resolve the issue:
Schedule a task with the Jet Scheduler; it will create a Windows task
Using the Windows Task Scheduler (typically in Control Panel | Administrative Tools), navigate to the Task Scheduler Library and right-click on the task in question
On the Actions tab there is an Action called Start a program which should look something like this:
C:\Program Files\JetReports\AutoPilot.exe /M "Update" /I "C:\test\test_reports\Book1.xlsx" /O "C:\test\test_reports\Output"
Change the first argument of the command line from
For Server 2003 and all versions of Jet Reports and Jet Essentials that support it, the only workaround for being able to access Windows Scheduled tasks is to grant the individual Jet user full administrator rights.